Dongfang Yang
ABSTRACT
According to the survey data about the waters of the Jiaozhou Bay from 1986 to 1990, through the changing trend of spatial sedimentation of Hg and the mechanism of the spatial sedimentation based on variation range of Hg content in both surface and bottom waters and the horizontal distribution trend of Hg content in both surface and bottom waters were adequately demonstrated. Therefore, With our research on the trends of both the surface and bottom horizontal distribution from 1986 to 1990, we found that from the start point, a position where the source of Hg was close to the surface horizontal distribution, to the end point, a position where the source of Hg was far from the surface horizontal distribution, the content of Hg decreased in gradient order. While the trend of the horizontal distribution in bottom waters, from the beginning to the end, had two changes: (1) gradient descent and (2) gradient rise. With all these efforts, the author proposed Dongfang Yang rules of the changes of Hg content in surface waters: no matter where it came from and how much it was, as long as the place stayed away from the source of Hg, the Hg content there in surface waters continued decreasing and to be deposited. When there was only one channel, the Hg content in surface waters conformed to the Dongfang Yang rules of the changes of Hg content in surface waters. When there were two ways of Hg transportation or more, regarding the major source as the start point, the Dongfang Yang rules of the changes of Hg content in surface waters could work here. At that time, the Hg content in the bottom waters didn't accumulated. Thereby, from the start point to the end point of the horizontal distribution of Hg, the Hg content experienced a gradient decease, showing the consistency of the trends of horizontal distribution of in both surface and bottom waters. As the Hg in the surface waters further decreased and was deposited, the Hg in the bottom waters began accumulating in a large amount. Thereby, from the start point to the end point of horizontal distribution of Hg in the bottom waters, the trend of the horizontal distribution of Hg content increased in gradient order, indicating that the trend of the horizontal distribution in the surface waters was opposite against that in the bottom waters.
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